DENVER'S PERMIT LINE: STRUCTURE, OPENINGS, DUCTS, NEW FIXTURES. LIKE FOR LIKE NEEDS NONE.

Denver Community Planning and Development requires a building permit for interior remodels and basement finishes when the project includes floor plan alterations, structural changes affecting load bearing walls, adding, resizing or removing doorways, windows, skylights or egress windows, new or rerouted ductwork, or new or relocated electrical or plumbing fixtures (VERIFIED). It does not require a permit for like for like replacement of existing cabinets, countertops, flooring or plumbing and electrical fixtures, for drywall repair smaller than one 4 by 8 sheet, or for replacing doors, glass or window frames unless the property is a landmark or in a historic district (VERIFIED).

A secondary source describes unpermitted finished space being excluded from an appraiser's square footage and livable space count and treated as unfinished for valuation, which can lower the price or cause a buyer to walk, and describes legalizing it afterward through an as-built permit process that is more complex and costly than permitting first (PROBABLE). The same source cites fee doubling for work started without a permit under Denver's building code, which was not confirmed against the code text (PROBABLE).

Colorado requires every residential contract or the disclosure form to state that the Department of Public Health and Environment strongly recommends an indoor radon test, and requires the seller to disclose any known test results, concentrations and whether a mitigation system was installed (C.R.S. 38-35.7-112, VERIFIED). Neither the radon statute nor the federal lead rule requires the seller to test; both require disclosing what the seller knows.